If the keys are anything like the keys on my G510 they wont fade for quite awhile. Heck even the used G15 I bought had no fading.

I hope that turns out to be the case, because both CMs I've used have had the issue, and the small Logitech I used before that (non-mechanical) did also. It's disappointing when the keyboard you love begins to look worse for wear after just a month or so.